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Validity : S N 1 - 730 28-20-00Page 4
(DA) SEP 02
FUEL SUPPLY
DESCRIPTION AND OPERATION
1. GENERAL
Fuel supply system is the sub-system which supplies engine with fuel necessary for its operation. Its main components are :
- the electric pump,
- the filter / selector,
- the filter installed in the tanks,
- the fuel tank selector control.
2. LOCATION (Figures 1 and 1A)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Electric pump 1 210 214 28-20-01
Filter / selector 1 210 215 28-20-02
Tank filter 2 510 / 610 511 / 611 28-20-03
Fuel tank selector control 1 250 253 28-20-04
3. DESCRIPTION A. Electric pump
The electric pump (also known as booster pump or auxiliary pump) supplies the engine pump and provides fuel pressure required for engine start-up.
The electric pump consists of :
- the pump casing, with a pressure relief valve and a by-pass valve,
- the electric motor.
S / N 731 - 822. 850 - 887. 889 - 947
The BUS 2 bar supplies energy to the electric pump.
S / N 823 - 849. 888. 948 - 9999
The BUS 1 bar supplies energy to the electric pump.
AEAB
Validity : S / N 731 - 9999 28 20-00Page 1
(DG) SEP 02
B. Filter / selector
The filter / selector assembly selects and opens the tanks and filters the fuel arriving at the electric pump. The filter / selector includes :
- the filter, located in the lower part of the assembly, has a filtering capacity of 100 microns and is equipped with a by-pass valve which opens at 0.120 bar ± 0.020 (1.74 psi ± 0.3),
- the selector, in the upper section, is a three-way distributor manually controlled by a button located on the central pedestal and named "FUEL SELECTOR". The control has the following positions : "OFF", "L TANK" and "R TANK".
C. Fuel tank filter
The strainer-type tank filter (one per tank) is located on the root pressure bulkhead of each tank.
D. Fuel tank selector control
The fuel tank selector enables the pilot to control the filter / selector assembly. The fuel tank selector control is located on the central pedestal.
4. OPERATION
The pilot selects the tank using the selector and the fuel flows to the electric and engine pumps through tank filter and filter / selector.
AEAB
Validity : S / N 731 - 9999 28-20-00Page 2
(DG) SEP 02
A - Electric pump
B - Filter / selector
C - Tank filter
D - Fuel tank selector controls
Fuel supply - Identification and location of components
Figure 1 - S / N 731 - 1037
AEAB
Validity : S / N 731 - 9999 28-20-00Page 3
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